High temperature mechanical behavior of low-pressure sand-cast Mg–Gd–Y–Zr magnesium alloy

Liu, Wencaı; Zhou, Beiping; Wu, Guohua; Zhang, Liang; Peng, Xuan; Cao, Lei

doi:10.1016/j.jma.2019.07.006

Cited by 66 publications

(10 citation statements)

References 25 publications

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“…[22,23] For the rare-earth Y, researchers focus on its impact on the strength and plasticity of magnesium alloys. [24,25] However, the effects of Y on the tension-compression yield asymmetry of magnesium alloys are rarely studied.…”

Section: Introductionmentioning

confidence: 99%

Improving Tension/Compression Asymmetry of a Hot‐Extruded Mg–Zn–Y–Zr Alloy via Yttrium Addition

et al. 2021

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In this study, effects of different yttrium (Y) contents ranging from 0 to 2.5 wt% on the microstructure and tension/compression asymmetry of as‐extruded Mg–5.5Zn–0.6Zr alloys are investigated. The influence of Y on improving the tension/compression yield strength is been studied. The results show that the volume fractions of the microscale I (Mg3YZn6) and W (Mg3Zn3Y2) phases remarkably increase with Y addition. Simultaneously, the nanoscale MgZn and Mg–Zn–Y phases uniformly precipitate during extrusion. Benefiting from the pinning of second phases, the microstructure is strikingly refined from 16.3 to 5.5 μm. Among them, the Y element promotes grain refinement most effectively when the Y content is 2.0 wt%. Second phase strengthening and fine‐grain strengthening enhance the hardening rate and suppress twinning, which leads to the improvement of the tension/compression asymmetry. Specifically, yield strength of 231 MPa and ultimate tensile strength of 312 MPa are achieved with 2.5 wt% Y addition. The relative increment is about 33.0% and 65.3% compared to the unmodified alloy, respectively. In addition, the tensile yield strength to compressive yield strength ratio (TYS/CYS) is reduced from 1.30 to 1.09.

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Section: Introductionmentioning

confidence: 99%

Improving Tension/Compression Asymmetry of a Hot‐Extruded Mg–Zn–Y–Zr Alloy via Yttrium Addition

et al. 2021

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“…By preparing Mg-Gd-x, Mg-Y-x ternary, or multiple alloy systems (x = Y [10][11][12], Sm [13,14], Nd [15], Zn [16][17][18], Ag [19][20][21], etc. ), most researchers studied the structure and precipitation sequence of rare earth strengthening phases [22], explored the mechanical properties and fracture modes of samples with different heat treatments [23], and investigated the strengthening mechanism of rare earth elements in magnesium alloys [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the addition of rare earth elements always increased the raw material cost; therefore, a potential alternative was to prepare application-oriented rare earth magnesium alloys by using high-abundance and low-cost rare earth elements, such as La, Ce, Y, etc. [23].…”

Section: Introductionmentioning

confidence: 99%

Study on the Strengthening Mechanism of Rare Earth Ce in Magnesium Alloys, Based on First-Principle Calculations and Electronegativity Theory

et al. 2021

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Since the commercial applications of rare earth magnesium alloys are increasing gradually, there are considerable advantages to developing lower cost and higher performance magnesium alloys with high abundance rare earth (RE) elements. However, the alloying order of a matrix magnesium alloy is completely changed with the addition of RE elements. Therefore, further study of the strengthening mechanism of Ce element in magnesium alloys is required. In this work, the thermodynamic stability of the possible second phases in a Mg-Al-Mn-Ce multicomponent magnesium alloy were analyzed, based on first-principle calculations, and the precipitation sequence of the key RE phases was deduced as a consequence. Combined with Scanning Electron Microscope (SEM), X-ray Diffractometer (XRD), Energy Dispersive Spectrometer (EDS), and other experimental methods, it was investigated whether the preferentially precipitated second phases were the nucleation core of primary α-Mg. The complex alloying problem and strengthening mechanism in a multi-elemental magnesium alloy system were simplified with the aid of electronegativity theory. The results showed that the preferentially precipitated Al11Ce3 and Al10Ce2Mn7 phases could not be the nucleation core of primary α-Mg, and the grain refinement mechanism was such that the second phases at the grain boundary prevented the growth of magnesium grains. Moreover, the tensile test results showed that the reinforced structure, in which the Al-Ce phase was mixed with Mg-Al phase, was beneficial for improving the mechanical properties of magnesium alloys, at both ambient temperature and high temperature.

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“…Light weight and safety have become important standards for assessing the quality of metal forging products [1][2][3][4]. Magnesium alloy is a new type of metal material with extensive development potential and has the advantages of light weight, high specific strength and stiffness, good dimensional stability, easy processing, and recycling ability [5,6]. Presently, the concept of using magnesium alloys in the manufacturing of equipment parts is very popular in the automotive industry, aerospace, weapons equipment manufacturing, and other fields [7,8].…”

Section: Introductionmentioning

confidence: 99%

3D Processing Maps of Cast Mg‐9Gd‐3Y Alloy and Numerical‐Experimental Verification

Luo

2021

Advances in Materials Science and Engineering

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The hot compression behavior of Mg-9Gd-3Y (GW93) alloy was investigated by carrying out isothermal compression tests at the deformation temperature range of 300–450°C and strain rate range of 0.001–1s−1. Considering the influence of the strain on the formability of the GW93 alloy, three-dimensional (3D) processing maps were established based on the dynamic material model. The 3D processing maps indicate that the formability of the material improved with the decrease of the strain rate and the increase of the heating temperature, and the material at lower heating temperature mostly underwent flow instability. The formable processing region of the hot deformation of the GW93 alloy was concentrated within the temperature range of 380–450°C and the strain rate range of 0.001–0.01 s−1. Subsequently, the 3D processing maps were embedded into the finite element (FE) software DEFORM-3D by means of user subroutines, and the formability of GW93 alloy during the isothermal plane strain forging process was predicted. The FE simulation results revealed that the formability of the material at low strain rate improved compared with that at high strain rate under the same temperature. Finally, an isothermal plane strain forging technological experiment was carried out, and the microstructure of the formed sample was analyzed. The experimental result is in good agreement with that of the numerical simulation. Combined with microstructural observation, the accuracy of the simulation results and the 3D processing maps of the GW93 alloy was verified.

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High temperature mechanical behavior of low-pressure sand-cast Mg–Gd–Y–Zr magnesium alloy

Cited by 66 publications

References 25 publications

Improving Tension/Compression Asymmetry of a Hot‐Extruded Mg–Zn–Y–Zr Alloy via Yttrium Addition

Improving Tension/Compression Asymmetry of a Hot‐Extruded Mg–Zn–Y–Zr Alloy via Yttrium Addition

Study on the Strengthening Mechanism of Rare Earth Ce in Magnesium Alloys, Based on First-Principle Calculations and Electronegativity Theory

3D Processing Maps of Cast Mg‐9Gd‐3Y Alloy and Numerical‐Experimental Verification

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